Safety-elevator.



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C. E. GRUMP. SAFETY BLBVATOR. APPLICATION FILED NOV. 30, 1904.

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No. 799,834. 7 PATENTBD SEPT. 19, 1905.

` C. E. CRUMP.

SAFETY ELBVATOR.

APPLIUATIOH FILED Nov. ao, 1904.

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CAROLYN EDWARD CRUMP, OF WASHINGTON, DISTRICT OF COLUMBIA.

SAFETY-EI EvAToR.`

ivo. r799,834.

Specification of Letters Patent.

` Patented sept. 19, 1905.

Application filed November SO, 1904. Serial N0. 234,951.

T0 nl 11i/tom, it may concern:

Be it known that I, CAEOLYN EDWARD CRUMP, a citizen of the UnitedStates, residing at IVashington, District of Columbia, .have inventedcertain new and useful Improvements in Safety-Elevators, of which thefollowing is a specification.

Elevators are generally constructed to carry a given load with safety,and any excess thereedge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanyingdrawings.

Figure 1 is a view in elevation of an elevator embodying the invention,the lower portion of the car being in section. Fig. 2 is a view similarto Fig. 1, showing the relation of the parts when the car is overloadedand locked to the guides of the shaft. Fig. 3 is a horizontal section onthe line w of Fig. 1. Fig. 4 is a detail view of the guide mechanismbetween the car and the movable or false platform.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The car 1, which may be of any pattern or make, is adapted to beoperated by any suitable hoisting mechanism and is directed in itsvertical movements by ways 2 at opposite sides of the shaft in thewell-known manner.

the lock-bolts 4 are mounted in openings 5 of the bottom 6 and. areadapted to be pressed outward by means of coil-springs 7. Cords 8 orlike flexible connections are interposed between the lock-bolts 4 andthe movable or false platform 9 and pass around guide-pulleys 10. Undernormal conditions the platform 9 is supported a distance above thebottom 6 and the lock-bolts 4 are held restricted against the tension ofthe springs 7. In the event of the car becoming overloaded the platform9 is pressed downward, and the lock-bolts 4 being relieved of restraintare shot outward by the springs 7 and engage with the teeth of the bars3 and hold the car in suspension.

The false platform 9 is yleldably mounted upon the bottom or'mainplatform 6 and is directed in its vertical movements by suitable guides,which, as shown, consist of toothed bags 11 and correspondingly-toothedwheels 12, the latter being mounted in brackets 13,'

secured to the platform 9. There are four toothed bars 11, each beinglocated near a corner of the car. constructed so as to embrace oppositesides of the toothed portion of the bars 11, so as to prevent lateraldisplacement of the platform 9. The teeth of the parts 11 and 12 are ofVform, thereby permitting of their free engagement and disengagement ineach direction as the platform 9 moves^ up and down. As shown, a spring14 is interposed between the platforms 6 and 9 and is preferablyarranged at a central point and is connected at its ends to each bysuitable attaching means. A housing 15 incloses the spring 14 and isconnected at its upper end with the platform 9. Webs or braces 16radiate from the housing l5 and stiften and strengthen the platform 9.The exible connections 8 pass upward through the spring 14 and housing15 and are connected at their upper ends to the platform 9 in anydeterminate way. The strength of the spring 14 is such as to sustain agiven load and to yield when the load is exceeded, thereby permittingthe connections 8 to slacken and the springs 7 to come into play andshoot the lock-bolts 4 into engagement with the toothed bars 3 and lockthe car or elevator in its shaft, thereby preventing strain of thehoisting mechanism and endangering the lives of passengers. A signal iscombined with the elevator and is preferably of the electric type andmay consist of either an audible or visual device, or both. The signalis indicated at 17 and may comprise a red light, an alarm-bell, and anindicator. The electric wires 18 extend from the signal 17 and termi-The toothed wheels 12 are IOO nate in contacts 19 and 20, which arenormally separated and which are brought into engagement upon descent ofthe platform-9 .whenl overloaded, thereby completing the alarmcircuitand giving warning of impending danger b v overload of the car. Theelectric contacts 2O are carried by the platform 9, whereas the contacts19 are attached to the bottom of platform 6.

The upward movement of the platform 9 may be limited by any means, andfor this purpose chains 21 are employed and arercon- Y nected at theirupper ends to said platform 9" and at their lower ends to the bottom orlower platform 6. It is contemplated to regulate the tension of thespring 14, and forthis purpose-a set-screw 22 is threaded into thebottom6, and its upper end engageswith aplate 23, upon which the lower end ofthe spring, 14. rests. It beingl remembered that the platform 9 islimited in its upward movement, aturning of the set-screw 22 to compressthe spring 14 more or less results in varying its resistance to the loadimposed thereon. In other words, the platform being limitedhin: itsupward movement by means of the Vchains 21 the spring 14 is compressedmore or less by turning` the set-screw 22, with the result vthat itstension is varied and may be regulated tosupport any determinate load.

. Having thus described the invention; what is claimed as new is- 1. lnan elevator, the combination of thecar, means carried by the car forlockingit in= 1 its shaft, a yieldable platform for receiving the load,and connections between thefyield-v able platform and locking means tonormally hold the latter in restraint.

2. In an elevator, the combination of a car, locking means carried bythe car for securing it .in its shaft, and a yieldable platform forresecuring` thecar in its shaft, and a yieldable I platform :forsustaining the load and adapted to control thelocking means,substantially as set forth.

4.. vIn an. elevator, the combinationof a car, spring-actuatedvlock-bolts, a yieldable platform, and positive connections between-saidplatform*V and lock-bolts for holding-the latter in restraint undernormal conditions.

5;: In an elevator, the combination of a car, oppositely disposed springactuated lockbolts, a movable platform, aspring interposed between-said'platform and the bottom of the car for normallysupporting the platform,a housingY inclosing l said spring, and flexible connections between theplatform and lockbolts, the latter being` normally held out of actionand adapted to be shot outward upon descent ofthe platform `by anexcess-of load.-

In=testimony whereof I aiiiX my signature in presence of-'two witnesses.

CAROL-YN EDWARDCRUMP. [1.. s.]

Witnesses: Y i

ROBERT'. V. .WILLETT, V. B. HILLYARD.`

